PAT 1084 Broken Keyboard

#include <cstdio>

#include <cstdlib>

#include <vector>



using namespace std;



char linea[82];

char lineb[82];

bool tbl[256];



char cap(char ch) {

     if (ch >= 'a' && ch <= 'z') {

        ch -= 'a' - 'A';

     }

     return ch;

}



int main() {

    scanf("%s", linea);

    scanf("%s", lineb);

    vector<char> broken;

    char cha, chb;

    int ia = 0, ib = 0;

    while (linea[ia]!= '\0' && lineb[ib] != '\0') {

          cha = cap(linea[ia]);

          chb = cap(lineb[ib]);

          if (cha == chb) {

              ia++, ib++;              

          } else {

              if (!tbl[cha]) {

                 broken.push_back(cha);

                 tbl[cha] = true;

              }

              ia++;

          }

    }

    while (linea[ia] != '\0') {

        cha = cap(linea[ia]);

        if (!tbl[cha]) {

           broken.push_back(cha);

           tbl[cha] = true;

        }

        ia++;

    }

    int len = broken.size();

    for (int i=0; i<len; i++){

        printf("%c", broken[i]);    

    }

    system("pause");    

    return 0;    

}

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